0620_s02_qp_3
TRANSCRIPT
TIME 1 hour 15 minutes
INSTRUCTIONS TO CANDIDATES
Write your name, Centre number and candidate number in the spaces at the top of this page.
Answer all questions.
Write your answers in the spaces provided on the question paper.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question or part question.
A copy of the periodic Table is printed on page 12.
International General Certificate of Secondary Education
CAMBRIDGE INTERNATIONAL EXAMINATIONS
CHEMISTRY 0620/3PAPER 3
MAY/JUNE SESSION 20021 hour 15 minutes
Candidates answer on the question paper.No additional materials are required.
This question paper consists of 12 printed pages.
(NH/CG) S12127/4© CIE 2002 [Turn over
CandidateCentre Number Number
Candidate Name
FOR EXAMINER’S USE
1
2
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TOTAL
http://www.xtremepapers.net
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0620/3 M/J/02
1 In 1886, the modern electrolytic process for the extraction of aluminium was discovered inthe USA by C. Hall.
(a) Before this discovery, the only method of extracting the metal was by displacement.
(i) Name a metal that can displace aluminium from aluminium chloride.
..................................................................................................................................[1]
(ii) Write a word equation for this displacement reaction.
..................................................................................................................................[1]
(iii) Complete the equation for the reaction.
AlCl3 + ....................... → ...................................... + ........................................[2]
(b) Aluminium is produced by the electrolysis of an electrolyte that contains aluminiumoxide.
(i) Write an ionic equation for the reduction of the aluminium ion at the cathode.
..................................................................................................................................[2]
(ii) Name the main ore of aluminium.
..................................................................................................................................[1]
(iii) Complete the following description of the electrolyte by filling the spaces.
The electrolyte is a ................................................ mixture of aluminium oxide
and .................................................. which is maintained at 900 °C. [2]
(iv) Explain why the gas given off at the anode is a mixture of oxygen and carbondioxide.
...................................................................................................................................
...............................................................................................................................[2]
(c) One property of aluminium is that it resists corrosion because it is covered with a layerof its oxide.
(i) Give one use of the metal that depends on this property.
..................................................................................................................................[1]
(ii) Give another use of the metal that depends on a different property.
use .............................................................................................................................
property..................................................................................................................[2]
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(d) The graph shows how the rate of the exothermic reaction between aluminium andhydrochloric acid varies with time.
(i) Suggest a reason why the reaction goes slowly at first.
..................................................................................................................................[1]
(ii) Suggest two reasons for the increase in rate.
......................................................................................................................................
..................................................................................................................................[2]
rate ofreaction
time00
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0620/3 M/J/02
2 Fermentation of sugars is one method of making ethanol. Vines produce glucose byphotosynthesis. The glucose collects in the grapes which grow in clusters on the vine.
(a) Vines are attacked by a fungus that ruins the grapes. In 1882 it was discovered thatspraying the vines with Bordeaux mixture killed the fungus.
The fungicide, Bordeaux mixture, contains water, calcium hydroxide and copper(II)sulphate.
(i) Name the raw material from which calcium hydroxide is made.
..................................................................................................................................[1]
(ii) The mixture contains four ions. Complete the list of ions.
Cu2+, OH–, ......................... and ............................. [2]
(iii) A different fungicide can be made by the reaction between an excess of aqueousammonia and a copper(II) salt. Describe the observations for this reaction.
addition of aqueous ammonia ...................................................................................
...................................................................................................................................
then excess aqueous ammonia ................................................................................
...............................................................................................................................[3]
(b) Explain how the vine produces glucose by photosynthesis.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................[4]
green leaves
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(c) The grapes are crushed to extract an aqueous solution of glucose. This solution isfermented to make ethanol. Explain why each of the following is necessary.
(i) yeast
...............................................................................................................................[1]
(ii) an absence of oxygen
...................................................................................................................................
...............................................................................................................................[2]
(iii) an optimum temperature of about 35 °C
...................................................................................................................................
...............................................................................................................................[2]
(d) Plants can make esters as well as sugars. The formula of a typical ester is drawn below.Deduce the names of the organic acid and of the alcohol from which the ester couldhave been made.
organic acid ......................................................................................................................
alcohol...........................................................................................................................[2]
CH3 CH2
CH2
O
OCH2 C
CH2 CH3
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0620/3 M/J/02
3 A major food retailer in the UK is going to distribute sandwiches using hydrogen-poweredvehicles.
(a) A sandwich contains three of the main constituents of food.
These constituents of food can all be hydrolysed by boiling with acid or alkali.
(i) Complete the table. [5]
(ii) What type of synthetic polymer contains the same linkage as
proteins, ....................................................................................................................
fats? ......................................................................................................................[2]
(iii) Fats can be unsaturated or saturated. A small amount of a fat was dissolved in anorganic solvent. Describe how you could find out if this fat was saturated orunsaturated.
reagent ......................................................................................................................
result if saturated ......................................................................................................
result if unsaturated ..................................................................................................
...............................................................................................................................[3]
bread containscarbohydrate
meat containsprotein
buttercontains fat
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constituent of food
protein
fat
complexcarbohydrate
linkage product of hydrolysis
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(b) One of the reasons for using hydrogen as a fuel is to reduce air pollution. Petroleum-powered vehicles are a major cause of air pollution. This pollution can be decreased byreactions of the type shown below.
2CO + 2NO → N2 + 2CO2
(i) Where in a vehicle does this type of reaction occur?
..................................................................................................................................[1]
(ii) Explain how carbon monoxide is formed in the engine.
...................................................................................................................................
...............................................................................................................................[2]
(iii) Give a reason why the hydrogen-powered vehicle produces less pollution.
...............................................................................................................................[1]
(c) Outline how hydrogen is manufactured from water.
..........................................................................................................................................
......................................................................................................................................[2]
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0620/3 M/J/02
4 Bromine is one of the halogens in Group VII.
(a) (i) Predict which halogen has the lightest colour.
...............................................................................................................................[1]
(ii) Predict which halogens are solids at room temperature.
...............................................................................................................................[1]
(b) Bromine is obtained from the bromide ions in sea water. Sea water is concentrated byevaporation. Chlorine gas is bubbled through the solution. Chlorine oxidises thebromide ion to bromine.
(i) Complete the following equation.
Cl2 + ......Br– → ................... + .................. [2]
(ii) Explain using the idea of electron transfer why the bromide ion is oxidised bychlorine.
The bromide ion is oxidised because ........................................................................
...................................................................................................................................
Chlorine is the oxidising agent because ....................................................................
...............................................................................................................................[2]
(iii) Name a reagent that can be oxidised by bromine molecules.
...............................................................................................................................[1]
(c) Bromine reacts with phosphorus to form phosphorus tribromide.Draw a diagram showing the arrangement of the valency electrons in one molecule ofthis covalent compound. The electron distribution of bromine is:
2 + 8 + 18 + 7.
Use x to represent an electron from phosphorus.Use o to represent an electron from bromine. [3]
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0620/3 M/J/02 [Turn over
(d) Phosphorus tribromide reacts with water to form two acids.
(i) Balance the equation for this reaction.
PBr3 + ......H2O → ......HBr + H3PO3[1]
(ii) Describe by giving essential details how you could show that phosphorous acid, H3PO3, is a weaker acid than hydrogen bromide.
...................................................................................................................................
...................................................................................................................................
...............................................................................................................................[2]
(e) Hydrogen bromide is an acid. When it is dissolved in water the following reaction occurs.
HBr + H2O → H3O+ + Br–
(i) Name the particle lost by the hydrogen bromide molecule.
...............................................................................................................................[1]
(ii) What type of reagent is the water molecule in this reaction?
...............................................................................................................................[1]
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0620/3 M/J/02
5 (a) The Kinetic Theory explains the properties of solids, liquids and gases in terms of themovement of particles.
Liquids and gases both take up the shape of the container but a gas always fills thecontainer. Explain this, using the ideas of the Kinetic Theory.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................[4]
(b) The following apparatus can be used to measure the rate of diffusion of a gas.
(i) What measurements would need to be taken to calculate the rate of diffusion of agas?
...............................................................................................................................[2]
(ii) Which gas, carbon dioxide or sulphur dioxide, would diffuse faster?Explain your choice.
...................................................................................................................................
...................................................................................................................................
...............................................................................................................................[3]
constantpressureapplied
gassyringe
gas
metal foil,gas escapesthrough smallhole in foil
fills container
liquid gas
does not fill containerbut has shape of bottomof container
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0620/3 M/J/02
(c) A 20 cm3 sample of butyne, C4H6, is burnt in 150 cm3 of oxygen. This is an excess ofoxygen.
2C4H6(g) + 11O2(g) → 8CO2(g) + 6H2O(l)
(i) What volume of oxygen reacts?
...............................................................................................................................[1]
(ii) What volume of carbon dioxide is produced?
...............................................................................................................................[1]
(iii) What is the total volume of gases left at the end of the reaction?
...............................................................................................................................[1]
(d) Calculate the mass of water formed when 9.0 g of butyne is burnt. The mass of onemole of butyne is 54 g.
from the above equation, 1 mole of butyne forms 3 moles of water
number of moles of butyne reacted ...............
number of moles of water formed .................
mass of water formed ............... g [3]
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0620/3 M/J/02
Gro
up
DA
TA S
HE
ET
Th
e P
erio
dic
Tab
le o
f th
e E
lem
ents
140
Ce
Cer
ium
58
141
Pr
Pra
seod
ymiu
m
59
144
Nd
Neo
dym
ium
60
Pm
Pro
met
hium
61
150
Sm
Sa
ma
riu
m
62
152
Eu
Eur
opiu
m
63
157
Gd
Gad
olin
ium
64
159
Tb
Ter
bium
65
162
Dy
Dys
pros
ium
66
165
Ho
Hol
miu
m
67
167
Er
Erb
ium
68
169
Tm
Thu
lium
69
173
Yb
Ytte
rbiu
m
70
175
Lu
Lute
tium
71
232
Th
Tho
rium
90
Pa
Pro
tact
iniu
m
91
238 U
Ura
nium
92
Np
Nep
tuni
um
93
Pu
Plu
toni
um
94
Am
Am
eric
ium
95
Cm
Cur
ium
96
Bk
Ber
keliu
m
97
Cf
Cal
iforn
ium
98
Es
Ein
stei
nium
99
Fm
Fer
miu
m
100
Md
Men
dele
vium
101
No
Nob
eliu
m
102
Lr
Law
renc
ium
103
1 HH
ydro
gen
1
7 Li
Lith
ium
3
23 Na
Sod
ium
11
24 Mg
Mag
nesi
um
12
40 Ca
Cal
cium
20
45 Sc
Sca
ndiu
m
21
48 Ti
Tita
nium
22
51 VV
anad
ium
23
52 Cr
Chr
omiu
m
24
55 Mn
Man
gane
se
25
56 Fe
Iron
26
59 Co
Cob
alt
27
59 Ni
Nic
kel
28
64 Cu
Cop
per
29
65 Zn
Zin
c
30
70 Ga
Gal
lium
31
27 Al
Alu
min
ium
13
11 BB
oron
5
12 CC
arbo
n
6
14 NN
itrog
en
7
16 OO
xyge
n
8
19 FF
luor
ine
9
28 Si
Sili
con
14
31 PP
hosp
horu
s
15
32 SS
ulph
ur16
35.5
Cl
Chl
orin
e17
40 Ar
Arg
on18
20 Ne
Neo
n10
4 He
Hel
ium
2
73 Ge
Ger
man
ium
32
75 As
Ars
enic
33
79 Se
Sel
eniu
m
34
80 Br
Bro
min
e
35
84 Kr
Kry
pton
36
39 KP
otas
sium
19
88 Sr
Str
ontiu
m
38
89 YY
ttriu
m
39
91 Zr
Zirc
oniu
m
40
93 Nb
Nio
bium
41
96 Mo
Mol
ybde
num
42
Tc
Tec
hnet
ium
43
101
Ru
Rut
heni
um
44
103
Rh
Rho
dium
45
106
Pd
Pal
ladi
um
46
108
Ag
Silv
er
47
112
Cd
Cad
miu
m
48
115
In Indi
um
49
119
Sn
Tin
50
122
Sb
Ant
imon
y
51
128
Te
Tel
luriu
m
52
127 I
Iodi
ne
53
131
Xe
Xen
on
54
137
Ba
Bar
ium
56
139
La
Lant
hanu
m
57*
178
Hf
Haf
nium
72
181
Ta
Tan
talu
m
73
184
WT
ungs
ten
74
186
Re
Rhe
nium
75
190
Os
Osm
ium
76
192 Ir
Irid
ium
77
195
Pt
Pla
tinum
78
197
Au
Gol
d
79
201
Hg
Mer
cury
80
204
Tl
Tha
llium
81
207
Pb
Lead
82
209
Bi
Bis
mut
h
83
Po
Pol
oniu
m
84
At
Ast
atin
e
85
Rn
Rad
on
86
Fr
Fra
nciu
m
87
227
Ac
Act
iniu
m
89†
9 Be
Ber
ylliu
m
4
III
IIIIV
VV
IV
II0
85 Rb
Rub
idiu
m
37
133
Cs
Cae
sium
55
226
Ra
Rad
ium
88
The
vol
ume
of o
ne m
ole
of a
ny g
as is
24
dm3
at r
oom
tem
pera
ture
and
pre
ssur
e (r
.t.p.
)
a Xb
a =
rel
ativ
e at
omic
mas
s
X=
ato
mic
sym
bol
b =
pro
ton
(ato
mic
) nu
mbe
r
Key
* 58-
71 L
anth
anoi
d se
ries
†90-
103
Act
inoi
d se
ries